Patients will be randomized to either arm after stratification of risk factors. Each arm will recruit 104 patients who have no LN and systemic metastasis as defined by CT/MRI and FDG-PET. The primary end point is grade 3-5 late toxicities, and secondary end points are 1) recurrence free survival; 2) acute toxicity of treatments; 3) sites of recurrence; 4) quality of life; 5) total treatment time. It is expected to take 5 years to recruit enough case number.